非持仓条件导致Pine Script指标BUY/SELL标签不显示问题咨询

问题逻辑非常清晰：指标中的「BUY」和「SELL」标签无法始终正常显示，问题根源是enterLong与enterShort的入场条件，尤其是其中的not inTrade限制，部分场景下平仓信号会同时触发入场判定。

核心需求是在指标中模拟如下策略逻辑：

FLAT                        = strategy.position_size == 0
LONG                        = strategy.position_size > 0
SHORT                       = strategy.position_size < 0
entry                       = strategy.position_avg_price

代码片段 #

//@version=4
study("非持仓状态问题", overlay = true, precision = 6)

// —————————— 常量定义 {
// ————— 输入选项
var string TD1 = "双向交易"
var string TD2 = "仅做多"
var string TD3 = "仅做空"
// }

// —————————— 参数设置 {
// ————— 入场参数
var string GP1 = "入场设置"
string  i_tradeDirection    = input(TD1, "交易方向", options = [TD1, TD2, TD3], group = GP1)

// ————— 用户选择的交易方向对应变量
var bool doLongs  = (i_tradeDirection == TD2 or i_tradeDirection == TD1)
var bool doShorts = (i_tradeDirection == TD3 or i_tradeDirection == TD1)
// }

// —————————— 指标计算 {
ema = ema(close, 200)
// }

// —————————— 策略逻辑计算 {
// ————— 持仓状态
var float entryPrice = na
var bool inLong = false
var bool inShort = false
bool inTrade = inLong or inShort

// ————— 信号条件
a = close > ema
enterLongCondition = not a[1] and a
enterShortCondition = a[1] and not a
exitLongCondition = enterShortCondition
exitShortCondition = enterLongCondition

// ————— 过滤条件
filterLong = true
filterShort = true

// ————— 入场触发
enterLong  = doLongs  and not inTrade and enterLongCondition
enterShort = doShorts and not inTrade and enterShortCondition

// ————— 止损计算
atr = atr(14)
stopLong  = min(lowest(5), min(close, open) - atr * 1.5)
stopShort = max(highest(5), max(close, open) + atr * 1.5)

// ————— 出场触发
exitLong  = inLong  and (exitLongCondition  or close < stopLong[1])
exitShort = inShort and (exitShortCondition or close > stopShort[1])

// ————— 状态更新
if enterLong
    inLong := true
    entryPrice := close
else if enterShort
    inShort := true
    entryPrice := close
else if exitLong
    inLong := false
    entryPrice := na
else if exitShort
    inShort := false
    entryPrice := na
// }

// —————————— 绘制内容 {
color colorBar = close > ema ? color.green : color.red
plot(ema, "EMA", color = colorBar, linewidth = 2, style = plot.style_circles)

// ————— 信号标签
plotshape(enterLong, style = shape.labelup, location = location.belowbar, color = color.new(color.green, 20), text = "BUY", textcolor = color.white, size = size.normal)
plotshape(enterShort, style = shape.labeldown, location = location.abovebar, color = color.new(color.red, 20), text = "SELL", textcolor = color.white, size = size.normal)
// }

内容的提问来源于stack exchange，提问作者nop